Valve-grinder.



N. E. MEREDITH.

VALVE GRINDER.

APPLIUATION FILED NOV. 18, 1911 1,015,902. atented Jan 30,1912.

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N. E. MEREDITH.

v VALVE GRINDER. APPLICATION FILED NOV. 18, 1911.

1,015,902. Patented Jan. 30, 1912.

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NOAH E. MEREDITH, OF LOS ANGELES, CALIFORNIA.

VALVE-GRINDER.

Specification of Letters Patent.

Patented Jan. 30,1912.

Application filed November 18, 1911. Serial No. 661,148.

To all whom it may concern Be it known that I, NOAH ELLswoR'rH MEREDITH, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Valve-Grinder, of which the following is a specification.

This invention relates to valve grinders adapted for grinding the valve of internal combustion engines, and the main object of the invention is LO provide means for this purpose which is simple in construction and efiective in operation.

This invention relates more particularly to a valve grinder adapted to produce alternating angular movements of the valve in opposite directions in such manner that the movements in one direction are greater than those in the opposite direction, and a fun ther object of the invention is to provide improved means for producing such motion by the operation of a continuously rotated shaft extending at right angles to the operated spindle of the valve grinder.

Other obj ects of the invention will appear hereinafter.

The accompanying drawings illustrate the invention, and referring thereto Figure 1 is a side elevation of the valve grinder showing in vertical section, a portion of an engine casing with the valve therein in cooperative relation with the grinder. Fig. 2 is. a vertical section of the valve grinder. Fig. 3 is a vertical section on line w*n2 in Fig. 2. Fig. 4 is a vertical section on line rc -50 in Fig. 2. Fig. 5 is a horizontal sect' 2n on line c -m in Fig. 2. Fig. 6 is a view similar to Fig. 5, showing a different position of the operating parts. Fig. 7 is a perspective showing a modified form of the operating member. Fig. 8 is a perspective showing another modification of the operating member.

Referring to Figs. 1 to 6, the device coinprises a form composed of a body portion 1 and a casing 4 screwing on to said body portion as shown at 5, a vertical. spindle 2 journaled in a vertical bearing 3 in Said body 1, a driving shaft 6 journaled in bearings 7 in said casing 4, and provided with an operating handle or crank 8, and interengaging devices on said operating or driving shaft 6 and on the spindle 2 for pro 'ducing alternate forward and back movements of the spindle by continuous rotation of the driving shaft. Casin 4 is formed with a handle portion 9 consisting of a tubular. upward extension from said casmg and said tubular extension being closed and being provided if desired, with a removable screw-plug 10 to facilitate oiling.

The operated spindle 2 carries at its upper end, a crown wheel 11, formed as a disk having upwardly projecting teeth 12, said teeth being preferably round or conoidal and the driving shaft 6 is provided with two sets of arms or teeth 13 and 141 engaging respectively with the teeth 12 of the crown wheel at the opposite sides of the center or axis of the spindle 2. These sets of teeth 13 and 14 may be fornfed as projections from a Single sleeve 15, secured to the shaft 6 by a set-screw 17, such construction rendering the angular relation of the said sets of teeth permanent. There may be any desired number of teeth in each set, for example, three teeth, as shown in Figs. 3 and -11. in each set, and said teeth in the respective sets are angu'larly displaced so that the teeth of one set are staggered or arranged alternately with relation to the teeth of the other set, and ,so that the teeth of the respective sets engage alternately with the teeth of the crown wheel. In the continuous rotation of the driving shaft 6 by its crank 8, the alternate engagement of the respective sets of teeth 13 and 14 with the teeth of the crown wheel cause alternate to and fro partial r0- tations of the crown wheel. The teeth 14 are longer orof greater radial'extension than the teeth 13 so that in their engagement with the teeth of the crown wheel, the teeth 14 will move the crown wheel a greater angular distance than is etlected by the engagement of the teeth 13.

"he spindle 2 is adapted to carry the bit for engaging the valve to be ground. Said bit may consist of a blade 18 pivoted on pin 19 at the lower end of a stem 20, said stem being screwthreaded "and'serewing into a sleeve 21 which is secured to the lower end of the spindle 2. Said sleeve 21 is preferably screw-threaded to screw onto a reduced screw-threaded portion 22 at the lower end of the spindle 2, and to jam against a shoulder 23 on said spindle. A. ball-bearing 24: is provided in an annular recess 25 at the bottom of the body 1, said ball-bearing engaging with the top of said recess, and with the top of the sleeve 21 to take the vertical thrust.

Referring to Fig. 1, the casing of an en described, is inserted through the opening.

. forwardly a definite distance, and after such gine is indicated at 29, said casing having shown'in Fig. 7, two in each set as shown in opening 26 normally closed by suitable Fig. .8, or three or more in each'set as may means not shown, and providing for access be desired. In each case, however, the teeth to valve'head 27 which seats on a seat. 28, or arms in each set are arranged angularly the objectof the grinder being to rub said equidistant and alternately or staggered valve head on its seat in such manner as to with relation to the teeth in the other set so true up the surfaces. The valve head is that the teethof the respective sets engage provided with a cut or groove 30 adapted to alternately with the. teeth of the crown be engaged by the bit of the grinder. wheel. i

The grinder is used as follows; The bit, What I claim is: r having been secured to the spindleQ as above 1- A valve grinder comprising a frame, 7

a spindle, rotatably mounted in said frame, a driving shaft journaled in the frame at right angles to the axis of the spindle, a wheel on the spindle provided with crown teeth and sets of teeth mounted on the driving shaft to engage the teeth of the crown wheel at opposite sides of the axis of the spindle, the teeth of the respective sets being ,arranged in different angular positions on the shaft to engage the crown wheel at different times so as to produce alternate forward and'backward. partial rotation of the crown wheel and spindle, and the teeth of one set being longer than the teeth of the other set and extending farther between the teeth of the crown wheel, to effect a greater angular rotation of the crown wheel by engagement of the longer teeth than is effected by the engagement of the shorter teeth.

2. A valve grinder comprising a frame, a spindle rotatably mountedin said frame, a driving shaft journaled-in the frame at right angles to the axis of the spindle, a wheel on the spindle provided with crown teeth, a sleeve -secured to the driving shaft and sets of teeth on said sleeve to engage the teeth of the crown wheel at opposite. sides of the axis of the spindle, the teeth of the respective sets being arranged different.

26 and engaged with the groove30 in head 27 the grinder being held in this. position by holding the handle portion so as to hold the bit in vertical position while the crank 8 is being operated. The shaft 6 is rotated by operation of crank Sand as each tooth 14: engages with and between the teeth 12 of the crown wheel 11, it turns the spindle 2 arm or tooth 14 passes out of engagement with the crown wheel, anarm or tooth 13 engages with the teeth 12 of the crown wheel at the other side of the center and turns the spindle 2 a certain amount in the reverse direction, this reverse partial rotation of the spindle being less than the forward rotation by the'tooth 14 by reason of the teeth 13 being shorter than the teeth 14. To provide for such engagement of theteeth, it is necessary that the teeth 12 of the crown wheel should be of sufficient depthto permit meshing or engagement of the longer teeth 1 therewith and deeper than is required for the teeth 13 as the'shorter teeth 13 do not reach as far between the crown wheel teeth as dothe longer teeth 14. By continuous rotation of the driving shaft 6 an alternate forward and back movement is imparted to the spindle 2 and to the valve head connected thereto, and at the same time crown wheel at different times so as to prothe valve head is given an intermittent duce alternate forward and backward parrogressive forward rotation, thereby equaltial rotation of the crown wheel and spindle, izing the grinding action throughout its surand the teeth of one set being longer than face. By the above described constructionl the teeth of the other set-and extending am able to provide this differential movefarther between the teeth of the crown ment of the valve operating spindle by conwheel, to effect a greater angular rotation tinuous rotation of a shaft extending at of the crown wheel by engagement of the right angles to said spindle, this construe longer teeth than is cffectediby the engagetion being of advantage in that the operatment of the'shorterteethr ing crank. or handle is thereby maintained Iii-testimony whereof, I have hereunto set in the most convenientposition for operany.v hand at Los Angeles, California,-this ation. As shown in Figs. 7 and 8, the two 13th of November, 1911;

sets of teeth may be arranged on different i a sleeves indicated at and 35, fastenedto i the shaft by separate. set-screws 86. 'There 1 In presence of I may be any desired number of teeth or arms FREDERICK E., LYON, in each set, forexample, one in each set' as GLADYS RUSSELL.

angular positions on the shaft to engage the 101i 

